A Star Cluster at a Great Distance from the Sun

question 112

Multiple Choice

A star cluster at a great distance from the Sun, but inside the Milky Way, appears to be fainter than a similar star cluster at a closer distance. Part of this is the expected result from the inverse square law, but the distant cluster will also appear fainter than expected by distance alone because

• A) the photons of light become "tired" and appear less bright as they travel.
• B) the cosmological redshift has moved some of the light into the infrared spectral region.
• C) star clusters are systematically smaller and hence less bright the farther they are from the galactic center and hence from the Sun.
• D) light is scattered and absorbed by interstellar dust and gas between distant clusters and Earth.

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